Give three reasons that organisms need
energy.

In the unit of Energy Flow, we will look at how organism need food to survive but eventually it too is eaten. In any ecosystem there is a hierarchy of feeding relationships that influences how nutrients and energy pass through it. We will also look at the sequence of organisms that provide food for one another is know as a food chain​.

​This unit will last 3 school days

​Essential idea:

Ecosystems require a continuous supply of energy to fuel life processes and to replace energy lost as heat.

Nature of science:

Use theories to explain natural phenomena—the concept of energy flow explains the limited length of food chains. (2.2)

Explain why there is a limited number of organisms in a food chain.​

Understanding

4.2.U1 ​Most ecosystems rely on a supply of energy from sunlight.

State how energy in carbon compounds enters most biological communities.

List three groups of autotrophs.

ll green plants, and some bacteria, are photoautotrophic – they use sunlight as a source of energy. This makes light the initial source of energy for almost all communities

In a few ecosystems the producers are chemoautotrophic bacteria, which use energy derived from chemical processes

Most ecosystems rely on a supply of energy from sunlight

Living organisms can harvest this energy through the process of photosynthesis

Autotrophs of plants, cyanobacteria, eukaryotic algae also carry out photosynthesis

Explanation:

Hope this helps! :P

Organisms need energy because:-

To live

To repair and regenerate body cells

To grow

for  example, forests have higher evapotranspiration than other ecosystems,  such  as grasslands, because of their deeper roots and greater leaf area. thus forests have a net moistening effect on the atmosphere and become a moisture source for downwind ecosystems.

that is wrong, its not thymus.